Here's a code snippet using SRFI 49, for Scheme. (A 2003 formalisation for a macro system that had been rocking around for a few decades, for a very old Lisp):

Here's a code snippet using SRFI 49, for Scheme. (A 2003 formalisation for a macro system that had been rocking around for a few decades, for a very old Lisp): define fac x if = x 0 1 * x fac - x 1 Python's keywords are sometimes shorter, but they are familiar to most Lispers, which some of the founders were.